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High Humidity reduces mechanical damage such as brittle paint but raises the risks of biological organisms, e.g. white efflorescence and green-to-black stains on a panel painting. [12] High Humidity also raises the risks of curving or warping of the wood over time, forcing the paint to flake off.
A restored gesso panel representing St. Martin of Tours, from St. Michael and All Angels Church, Lyndhurst, Hampshire. Gesso (Italian pronunciation:; 'chalk', from the Latin: gypsum, from Greek: γύψος), also known as "glue gesso" or "Italian gesso", [1] is a white paint mixture used to coat rigid surfaces such as wooden painting panels or masonite as a permanent absorbent primer substrate ...
The presence of pigment discoloration, stains and the formation of bio-film are indicative of chemical degradation. Given the variety of organic and inorganic molecules present in frescoes, many type of micro-organisms may grow on the substrate of the fresco provided that environmental conditions (humidity, temperature, light, and pH) are ...
The panel contains four individual pieces of oak, painted over a chalk ground bound with glue. [16] The preparation wood is dated to around 1410, giving an estimated date for the Van der Weyden in the mid-1430s. [2]
Mummy portrait of a girl, AD 120–150, Roman Egypt, wax encaustic painting on sycamore wood. Encaustic is a method of painting that involves dry pigments mixed with hot beeswax, then applied to the surface of a support such as wood or canvas. A completed painting is then finished by taking a source of heat to reheat the surface and fuse it ...
Wood is a very absorbing material based on its environment. Thus, depending on the amount of water that is exposed in the air, the wood can expand and contract easily, changing the physical condition of the object. [19] This is the reason why wood material needs to be kept in a high controlled and consistent temperature and humidity levels.